Evaluation of risk factors of the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography

doi:10.3877/cma.j.issn.1674-1366.2021.01.003

Abstract

Abstract:

Objective

To analyze the risk factors affecting the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography (CBCT) .

Methods

CBCT data were collected from 124 patients in Stomatological Hospital of Hefei, from Jan. 2018 to Jan. 2020. There were 67 males and 57 females with an average age of 32.52 years, ranging from 18 to 65 years old. The depth of distal alveolar bone defect and the length of distal root were measured by CBCT, and the degree of distal alveolar bone defect of MSM was calculated. A comparative analysis of the impactions of different factors in terms of gender, age, depth of impacted MTM, MTM tendency, MTM/MSM contact type and observation site of patients on the extent of distal alveolar bone resorption was conducted withnon-parametric Kruskal-Wallis test.

Results

(1) Among the 124 study cases, themisally inclined (41.1%) and median impaction (49.2%) of MTM were more than the other types of impactions. Besides, 107 cases of MTM/MSM (86.3%) were in a tight contact, and the contact point was mostly located in the middle of MSM root (41.1%) . (2) The influences on the degree of distal alveolar bone defect with different age (χ² = 7.807, P = 0.02) , depth of impacted MTM (χ² = 11.397, P = 0.003) , MTM tendency (χ² = 16.835, P = 0.001) and MTM-MSM contact type (χ² = 20.331, P<0.001) were significantly different.

Conclusions

Distal alveolar bone defect of MSM caused by MTM is very common, and its risk factors are closely related to age, depth of impacted MTM, inclination angle of MTM/MSM axis and contact position.

Key words: Cone-beam computed tomography, Molar, third, Molar, Alveolar bone loss, Risk factors

Suyun Zeng, Fengqin Guo, Jianguang Wang. Evaluation of risk factors of the distal alveolar bone resorption of the second molar associated with impacted mandibular third molar by cone-beam computed tomography[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2021, 15(01): 13-17.

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References 18

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变量		样本量[例（%）]	牙槽骨缺损程度（例）				χ²值	P值
变量		样本量[例（%）]	无	轻度	中度	重度	χ²值	P值
年龄（岁）							7.807	0.020
	18 ~ 29	49（26.6）	7	5	27	10
	30 ~ 49	57（56.5）	8	17	29	3
	50 ~ 65	18（16.9）	1	2	12	3
性别							1.270	0.260
	男	67（54.0）	12	12	35	8
	女	57（46.0）	4	12	33	8
部位							0.289	0.591
	左侧	51（41.1）	7	9	31	4
	右侧	73（58.9）	9	15	37	12
MTM阻生深度							11.397	0.003
	高位阻生	28（22.6）	8	5	14	1
	中位阻生	61（49.2）	3	7	42	9
	低位阻生	35（38.2）	5	12	12	6
MTM/MSM轴倾角							16.835	0.001
	水平	7（5.6）	0	0	6	1
	近中	51（41.1）	3	11	31	6
	垂直	47（37.9）	8	4	26	9
	远中	19（15.3）	5	9	5	0
接触部位							20.331	0.000
	无	17（13.7）	5	8	2	2
	颈部	25（20.2）	5	5	14	1
	根中部	51（41.1）	1	3	40	7
	根尖部	31（25.0）	5	8	12	6

变量		样本量[例（%）]	牙槽骨缺损程度（例）				χ²值	P值
变量		样本量[例（%）]	无	轻度	中度	重度	χ²值	P值
年龄（岁）							7.807	0.020
	18 ~ 29	49（26.6）	7	5	27	10
	30 ~ 49	57（56.5）	8	17	29	3
	50 ~ 65	18（16.9）	1	2	12	3
性别							1.270	0.260
	男	67（54.0）	12	12	35	8
	女	57（46.0）	4	12	33	8
部位							0.289	0.591
	左侧	51（41.1）	7	9	31	4
	右侧	73（58.9）	9	15	37	12
MTM阻生深度							11.397	0.003
	高位阻生	28（22.6）	8	5	14	1
	中位阻生	61（49.2）	3	7	42	9
	低位阻生	35（38.2）	5	12	12	6
MTM/MSM轴倾角							16.835	0.001
	水平	7（5.6）	0	0	6	1
	近中	51（41.1）	3	11	31	6
	垂直	47（37.9）	8	4	26	9
	远中	19（15.3）	5	9	5	0
接触部位							20.331	0.000
	无	17（13.7）	5	8	2	2
	颈部	25（20.2）	5	5	14	1
	根中部	51（41.1）	1	3	40	7
	根尖部	31（25.0）	5	8	12	6

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